20020620602666 has 16 divisors (see below), whose sum is σ = 30038899782600. Its totient is φ = 10007654350848.

The previous prime is 20020620602629. The next prime is 20020620602683. The reversal of 20020620602666 is 66620602602002.

It can be written as a sum of positive squares in 4 ways, for example, as 20016040697041 + 4579905625 = 4473929^2 + 67675^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129582470 + ... + 129736878.

Almost surely, 2^{20020620602666} is an apocalyptic number.

20020620602666 is a deficient number, since it is larger than the sum of its proper divisors (10018279179934).

20020620602666 is a wasteful number, since it uses less digits than its factorization.

20020620602666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171193.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 20020620602666 in words is "twenty trillion, twenty billion, six hundred twenty million, six hundred two thousand, six hundred sixty-six".